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Why does RNA polymerase work in direction 5 to 3 not from 3 to 5?

April 26, 2017direction polymerase RNA

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Why does RNA polymerase work in direction 5 to 3 not from 3 to 5?

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Any polymerase (DNA or RNA) works in the 5`-3` direction (downstream) because the 3` end contains the hydroxyl groups. The 5` phosphate binds covalently with the 3` hydroxyl group forming a phospho diester linkage.